Evonik Roehm Gmbh

Evonik Rohm Gmbh

Roehm Gmbh & Co Kg

Hermann Siegert

Alexander May

Bernd Vogel

Jochen Ackermann

Dirk Broell

Soenke Broecker

Udo Gropp

Horst Hiltner

Thomas Schaefer

Lothar Eggeling

Achim Marx

Thomas Quandt

Markus Poetter

Stefan Buchholz

Martin Koestner

Kurt-Alfred Gaudschun

Ruediger Carloff

Markus Pötter

Joerg Becker

Dirk Bröll

Georg Fuchs

Ingrid Lunt-Rieg

Hans-Rolf Rausch

Jochen Ackerman

Thomas Krauss

Joerg Schallenberg

Birgit Alber

Martin KÖSTNER

Jörg Becker

Sönke BRÖCKER

The present invention relates to a catalyst for reacting carbonitriles with water, wherein the catalyst comprises at least 60% by weight of manganese dioxide with an empirical formula MnOx where x is in the range from 1.7 to 2.0, and at least one plasticizer. The present invention further relates to a process for preparing the catalysts detailed above and to a process for preparing carboxamides by reacting carbonitriles with water in the presence of the present catalyst.

Catalyst for reacting carboxylic acid nitriles

The present invention relates to a process for the preparation of methacrylic acid or methacrylic esters, comprising the process steps of The invention also relates to a process for the preparation of polymethacrylic acid or polymethacrylic esters.

Process for preparing methacrylic acid or methacrylic esters

The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.

Method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid

The present invention relates to processes for transesterification, comprising the steps of

Transesterification methods

The present invention relates to a process for preparing methacrylic acid based on the hydrolysis of methacrylic esters.

Process for preparing methacrylic acid

Alpha-hydroxycarboxylic esters are prepared by a continuous process in which alpha-hydroxycarboxamide is reacted with an alcohol in the presence of a catalyst to obtain a product mixture which contains alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide and alcohol, and catalyst; wherein reactant streams containing an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor. The reactant streams are reacted with one another in the pressure reactor at a pressure in the range of 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia by distilling off ammonia at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process can be employed particularly advantageously on the industrial scale.

Process for preparing alpha-hydroxycarboxylic esters

The invention relates to an improved method for the continuous production of alkyl(methyl)acrylates by transesterification of methyl(meth)acrylate with alcohols that are heavy in comparison with methanol. A special processing technique makes it possible to obtain new levels of product quality. Very high space-time-overall yields can also be obtained. The invention is characterized by the multiple use of a homogeneous catalyst which thereby reduces the costs of auxiliary agents significantly.

Method for the continuous production of alkyl(meth)acrylates with multiple catalyst recycling

Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed in the bottom of a rectification column.

Method for purifying polymerizable compounds

The present invention relates to a process for preparing carboxamides by hydrolysing carbonitriles in the presence of a catalyst comprising manganese dioxide, wherein the reaction mixture added to the catalyst comprising manganese dioxide has a pH in the range of 6.0 to 11.0 and the hydrolysis is performed in the presence of an oxidizing agent. The present invention further relates to a process for preparing alkyl (meth)acrylates, the process having a hydrolysis step according to the process described above.

Process for preparing carboxamides by hydrolysis carboxylic acid nitriles in the presence of a catalyst comprising manganese dioxide

The present invention relates to a process for preparing (meth)acrylic acid, characterized in that a cyclic ester is converted to (meth)acrylic acid in the presence of a catalyst. The (meth)acrylic acid prepared can in particular be converted to (meth)acrylates.

Process for preparing (meth)acrylic acid

Process for continuously preparing unsaturated carboxylic anhydrides of the general formula IR&#x2014;C(O)&#x2014;O&#x2014;C(O)&#x2014;R&#x2003;&#x2003;(I)in which R is an unsaturated organic radical having 2 to 12 carbon atomsby transanhydridization of an aliphatic carboxylic anhydride with a carboxylic acid of the general formula IIR&#x2014;COOH&#x2003;&#x2003;(II)in which R is as defined abovein a rectification column having an upper, middle and lower region, characterized in that

Method for the continuous production of unsaturated carboxylic acid anhydrides

The present invention relates to processes for preparing alkyl (meth)acrylates, comprising the steps of

Methods for producing alkyl(meth)acrylates

The present invention relates to a process for preparing tetramethylglycolide by heating a composition which comprises at least 50% by weight of 2-hydroxy-isobutyric acid and/or tetramethylglycolide to a temperature of at least 100&#xb0; C.

Process for preparing tetramethyl glycolide

The invention relates to a method for the continuous production of unsaturated carboxylic acid anhydrides of general formula (I): R&#x2014;C(O)&#x2014;O&#x2014;C(O)&#x2014;R (I), wherein R is an unsaturated organic group with 2 to 12 C atoms, by reaction of a ketene with an unsaturated carboxylic acid of general formula (II): R&#x2014;COOH (II), wherein R is defined as above, in an apparatus which has a reaction zone () for the reaction of a ketene with an unsaturated carboxylic acid of general formula (II), and a reaction zone () for the subsequent reaction of the crude anhydride mixture and a rectification column with an upper, a middle and a lower zone, in the sump of which an inert boiling oil is present.

A process for the production of hydrogen cyanide is provided, wherein hydrogen cyanide is synthesized by reacting methane or methane-containing natural gas, ammonia and oxygen-enriched air or oxygen in the presence of a catalyst comprising platinum or a platinum alloy; wherein the reactants are present in the following molar ratios

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Seeheim-Jugenheim, Germany

Hermann Siegert